Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f04423f11b0a97b3c14e2e4212cdac372719d4fd596ccc360c432b12e74e90' 
  AND token = 'iqnK+1U+RTPzqRXJdUawjv3545PF4ctkDPeRlvvutKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}